85 



tions of Cuvier to depend upon [the number of constrictor 

 muscles, and their situation. He found in all singing birds 

 five pairs : 



Two anterior longitudinal contractors. 



Two posterior do. 



Two small do. 



Two oblique 



Two transverse 



Jn most birds which do not sing there is in general only 

 one pair. 



2. HORTENSIS. GREATER PETTY-CHAPS. 



S. griseofusca, subtus rufo alba, super cilns albidis, 

 remigibus cinereo fuscis, margins griseis, rectri- 

 cibus fuscis, extima extus et versus apicem intus 

 albida. Shaw. 



The bill is dusky, the base of the under mandible 

 is yellowish ; irides hazel ; the orbits white ; plumage 

 light brown, inclining to olive ; below the ear is a 

 dash of ash colour j the throat, neck and sides are 

 dirty white, inclining to brown ; the belly and under 

 tail coverts white; the quills and tail feathers are 

 dusky, edged with olive ; the legs are bluish brown. 



The length is 6 inches. 



The greater petty-chaps arrives about the middle 

 of April. 



It forms its nest of fibrous plants. 



The female lays 4 dirty white eggs, blotched with 

 light brown. 



